Our standard length barrels are furnished as a 28" long blank that will finish up to 27". Most caliber/twist combinations can be ordered in a finish length up to 30" at an additional charge.

Only the
following caliber/twist combinations can be ordered over 30" in length. Maximum finish length is 45" unless indicated otherwise.

Caliber

Twist

Grooves

Max. Length

6mm

8"

3

36"

6.5mm

8

3

45

7mm

7

3

36

9

4

36

.308

10

3

45

10

6

45

11

3

45

13

3

34 W/.299" bore

.338

9 & 10

6

45

.358

10 &12

6

45

.375

9 & 10

6

45

.408

13

6

45

.416

12

8

45

13

6

45

.435

16

6

45

.510

13 & 15

6

45

Twist Selection

For help in selecting the correct twist rate for the bullet you plan
to use please refer to the chart below. The rate should be based on the
heaviest bullet you intend to use. We are also very willing to
help you determine the correct twist. You may contact Dan with questions
by e-mail CLICK HERE.

BULLET WEIGHT / CALIBER / TWIST RATE CHART

Grain/Cal

.172

.204

.224

.243

.257

.264

.277

.284

.308

.338

.358

17-20

9-10

25

10

30

9

12

33

12

35

12

37 VLD

6

40

12

50-52

9

14

55

12

60

12

68-69

9,10

13,14

75

9

14

80

8

85

7

12

12

12

90

7

10

100

10

10

12

14

105-107

8

120

10

10

12

15,16

130

10

14

140

9

10

10

150

14

140-160

8

10

10

12,13

150-168

9

11,12,13

150-180

10,11,12

160

9

175

9

180

10,11,12

200

10,11

10,12

12,16

220

10

225

10,12

12,16

240-250

10

10

12

300

10

12

The above chart is from our FAQ section. For more information about choosing
the correct twist rate Click
Here. This chart is based on jacketed lead-core bullets. With some monolithic and plastic-tipped bullets the above twists may be too slow. The reason for this is that copper and yellow-metal bullets are less dense than lead-core bullets and so with bullets of an equal weight the monolithic bullets are longer. And length has a lot of influence on twist required. The plastic tips on some bullets also add length without weight.

To read an article on bullet design and download a free program that
calculates twist rate based on specific bullet dimensions Click
Here